CN112682618A - three-PE corrosion prevention method for steel outer protection pipe - Google Patents
three-PE corrosion prevention method for steel outer protection pipe Download PDFInfo
- Publication number
- CN112682618A CN112682618A CN202011148735.0A CN202011148735A CN112682618A CN 112682618 A CN112682618 A CN 112682618A CN 202011148735 A CN202011148735 A CN 202011148735A CN 112682618 A CN112682618 A CN 112682618A
- Authority
- CN
- China
- Prior art keywords
- steel outer
- pipe
- protection pipe
- outer protection
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 99
- 239000010959 steel Substances 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000005536 corrosion prevention Methods 0.000 title claims description 15
- 239000010410 layer Substances 0.000 claims abstract description 93
- 238000005260 corrosion Methods 0.000 claims abstract description 55
- 238000000576 coating method Methods 0.000 claims abstract description 47
- 239000011248 coating agent Substances 0.000 claims abstract description 42
- 238000007689 inspection Methods 0.000 claims abstract description 20
- 230000001681 protective effect Effects 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 239000004593 Epoxy Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000011156 evaluation Methods 0.000 claims abstract description 11
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000012790 adhesive layer Substances 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 239000004698 Polyethylene Substances 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 14
- FVCPXLWAKNJIKK-UHFFFAOYSA-N Dimexano Chemical compound COC(=S)SSC(=S)OC FVCPXLWAKNJIKK-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- -1 polyethylene Polymers 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 230000037303 wrinkles Effects 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 description 13
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Landscapes
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention provides a three PE anticorrosion method for a steel outer protecting pipe, which comprises the following steps of; s1, cleaning the outer surface of the steel outer protecting pipe; s2, performing temperature control treatment on the outer surface of the steel outer protective pipe; s3, carrying out rust removal treatment on the outer surface of the steel outer protecting pipe; s4, coating an epoxy powder coating, an adhesive layer and an external anticorrosive layer on the outer wall of the steel outer protection pipe from inside to outside in sequence; s5, removing the three anti-corrosion layers at the pipe end part after the three anti-corrosion layers of the steel outer protective pipe are coated; and S6, carrying out process evaluation test and quality inspection on the three-layer anticorrosive layer. According to the three-PE anti-corrosion method for the steel outer protection pipe, the corresponding three anti-corrosion layers are coated on the steel outer protection pipe of each specification, a temperature control treatment mode of medium-frequency heating is adopted for heating, the coating efficiency is improved, and the anti-corrosion pipe has the advantages of smooth surface, no hidden bubbles, no pits, no wrinkles, no cracks, uniform color, no raised edges at the end of the anti-corrosion pipe and the like.
Description
Technical Field
The invention belongs to the technical field of corrosion prevention of steel outer protection pipes, and particularly relates to a three-PE corrosion prevention method for a steel outer protection pipe.
Background
At present, the anticorrosion steel pipe is mostly used in more important occasions, in particular to the aspects of petroleum, chemical engineering, natural gas, heat energy, water conservancy, roads, bridges, water conservancy and the like, and the traditional solvent-based coating has the following defects: firstly, the components of the formula are not environment-friendly and pollute the environment; the solvent-based paint needs to be diluted by adding solvents such as dimethylbenzene and the like in the coating process and then is sprayed, and the dimethylbenzene has the characteristics of strong smell, flammability, easy damage to human bodies and the like, and is easy to cause great harm to constructors and the surrounding environment in the spraying engineering; secondly, the multilayer spraying construction of the liquid coating on the outer wall of the steel pipe is influenced by the environmental temperature and the field, the assembly line operation cannot be realized, and the construction efficiency is low; at present, a common anticorrosive layer used on a steel outer protection pipe is generally a polyethylene anticorrosive layer (3LPE) with two to three layers, when an anticorrosive steel pipe coated with the anticorrosive layer passes through a mountain, a river and other regions with severe environment, the anticorrosive layer coated outside the steel outer protection pipe is easily damaged in a large area, so that the anticorrosive function of the steel pipe is weakened or lost, and the properties such as the insulation resistivity of the anticorrosive layer are rapidly reduced, so that the maintenance cost of the steel pipe passing through is high, and the maintenance difficulty is high. However, in the prior art, the pipeline laying site is rough in work, the process condition is poor, the construction environment is also severe, the forming time is long, the efficiency is low, a continuous and compact structural layer is difficult to form, and the anti-corrosion technology at the pipeline repaired mouth has a great influence on the overall anti-corrosion effect of the pipeline because the technology is related to the final anti-corrosion quality of the whole pipeline. No matter how good the quality of 3LPE and 3LPP anticorrosive coatings in a prefabricated factory is, if the on-site joint coating effect is not good, the steel pipeline can be seriously corroded, the service life of the buried pipeline is shortened, and even serious consequences such as leakage are caused.
Disclosure of Invention
In view of the above, the present invention is directed to a tri-PE corrosion prevention method for a steel outer protection pipe, so as to solve the deficiencies of the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a three PE anticorrosion method for a steel outer protective pipe comprises the following steps;
s1, performing primary cleaning treatment on the outer surface of the steel outer protective pipe;
s2, performing temperature control treatment on the outer surface of the steel outer protecting pipe;
s3, carrying out rust removal treatment on the outer surface of the steel outer protection pipe, and carrying out quality inspection on the steel outer protection pipe;
s4, coating an epoxy powder coating, an adhesive layer and an external anticorrosive layer on the outer wall of the steel outer protection pipe from inside to outside in sequence, wherein the epoxy powder coating, the adhesive layer and the external anticorrosive layer form three anticorrosive layers;
s5, removing the three anti-corrosion layers at the pipe end part after the coating of the three anti-corrosion layers of the steel outer protection pipe is finished, wherein the reserved length range of the pipe end is 150-180 mm;
and S6, carrying out process evaluation test and quality inspection on the three-layer anticorrosive layer.
Further, in step S4, the outer anticorrosion layer is made of reinforced, normal temperature polyethylene material.
Furthermore, a chamfer is formed on the section of the three anti-corrosion layers in the step S5, the chamfer is an acute angle, the chamfer range is not more than 30 degrees, and 20mm of epoxy powder coating is reserved outside the end part of the outer anti-corrosion layer.
Further, the quality inspection method of the steel outer protection pipe in step S3 includes:
b1, detecting the dust degree of the surface of the steel outer protective pipe;
b2, measuring the salt content on the surface of the steel outer protective pipe, wherein the salt content is not more than 20mg/m2；
And B3, visually comparing the corresponding pictures or standard plates when the steel outer protective pipe is subjected to rust removal treatment, wherein the surface rust removal quality is up to SS2.5 grade, and the anchor line depth range is 50-90 mu m.
Further, the temperature control processing method of the steel outer protection pipe in step S2 includes: the steel outer protection pipe is heated by adopting a medium-frequency heating mode, the temperature range of medium-frequency heating is generally 35-45 ℃, the surface temperature of the steel outer protection pipe is not more than 50 ℃, the surface temperature of the steel outer protection pipe is higher than the dew point temperature of the steel outer protection pipe, and the temperature difference between the surface temperature of the steel outer protection pipe and the dew point temperature of the steel outer protection pipe is higher than 3 ℃.
Further, the process evaluation test method in step S6 is: and detecting the performances of the three anticorrosive layers and the external anticorrosive layer.
Further, the quality inspection method of the three-layer anticorrosive coating in step S6 is as follows:
c1, detecting the appearance of the external anticorrosive layer;
c2, detecting the leakage point of the three-layer anticorrosive coating;
c3, detecting the thickness of the three-layer anticorrosive layer, and detecting the thickness and the thermal property of the epoxy powder layer;
c4, carrying out cathodic disbonding test detection on the anticorrosion pipe;
and C5, testing the tensile strength and the fracture nominal strain of the anticorrosive pipe.
Compared with the prior art, the tri-PE corrosion prevention method for the steel outer protection pipe has the following advantages:
(1) according to the three-PE anti-corrosion method for the steel outer protection pipe, the corresponding three anti-corrosion layers are coated on the steel outer protection pipe with each specification, a temperature control treatment mode of medium-frequency heating is adopted for heating, so that the coating in the steel outer protection pipe is always kept within a set temperature range, the assembly line operation is easy to realize, the coating efficiency is improved, the anti-corrosion pipe has the advantages of smooth surface, no hidden bubbles, no pits, no wrinkles, no cracks, uniform color, no raised edges at the end of the anti-corrosion pipe and the like, the international standard requirements can be met, and the three-PE anti-corrosion method is simple and convenient to construct, standardized and easy to popularize.
(2) According to the three-PE corrosion prevention method for the steel outer protection pipe, the section of the three corrosion prevention layers forms a chamfer angle, the chamfer angle is an acute angle, the chamfer angle range is not more than 30 degrees, and the epoxy powder coating with the thickness of 20mm is reserved outside the end part of the outer corrosion prevention layer, so that edge warping is prevented, and operations such as pipeline joint coating are facilitated.
(3) The three-PE anti-corrosion method for the steel outer protection pipe, disclosed by the invention, is used for carrying out a standardized process evaluation test and quality inspection on the anti-corrosion pipe, so that the quality of the anti-corrosion pipe can be accurately controlled, and the qualification degree of the anti-corrosion pipe is improved.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used merely for convenience in describing and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail with reference to examples.
A three PE anticorrosion method for a steel outer protective pipe comprises the following steps;
s1, performing primary cleaning treatment on the outer surface of the steel outer protection pipe, and removing attachments such as grease, dirt and the like on the surface of the steel outer protection pipe before the anticorrosive coating is coated;
s2, performing temperature control treatment on the outer surface of the steel outer protecting pipe;
s3, carrying out rust removal treatment on the outer surface of the steel outer protection pipe, and carrying out quality inspection on the steel outer protection pipe;
s4, coating an epoxy powder coating, an adhesive layer and an external anticorrosive layer on the outer wall of the steel outer protection pipe in sequence from inside to outside, wherein the epoxy powder coating, the adhesive layer and the external anticorrosive layer form three anticorrosive layers.
S5, removing the three anti-corrosion layers at the pipe end part after the coating of the three anti-corrosion layers of the steel outer protection pipe is finished, wherein the reserved length range of the pipe end is 150-180 mm;
s6, carrying out process evaluation test and quality inspection on the three anti-corrosion layers, coating the corresponding three anti-corrosion layers on the steel outer protective pipes of each specification, heating by adopting a temperature control treatment mode of medium-frequency heating, ensuring that the coating in the steel outer protective pipes is always kept within a set temperature range, easily realizing flow line operation, improving coating efficiency, having the advantages of smooth surface, no hidden bubbles, no pits, no wrinkles, no cracks, uniform color, no raised edges at the end of the anti-corrosion pipe and the like, meeting the international standard requirements, and being simple and convenient to construct, standardized and easy to popularize.
The material of the external anti-corrosion layer in step S4 is reinforced, normal temperature polyethylene material.
And forming a chamfer on the section of the three anticorrosive layers in the step S5, wherein the chamfer is an acute angle, the chamfer range is not more than 30 degrees, and the end part of the external anticorrosive layer is externally retained with a 20mm epoxy powder coating to prevent edge warping.
The quality inspection method of the steel outer protection pipe in the step S3 includes:
b1, detecting the dust degree of the surface of the steel outer protection pipe, wherein in the actual detection process, a worker measures the dust degree of the surface of the steel outer protection pipe at least twice every shift (not more than 12h), detects two steel outer protection pipes every time, the dust degree is not lower than 2 grades specified in GB/T18750.3, and dust and residual abrasive materials do not exist in the steel outer protection pipe after rust removal;
b2, measuring the salt content on the surface of the steel outer protective pipe, wherein the salt content is not more than 20mg/m2During actual detection, a worker detects salt on the surfaces of at least 2 steel outer protective pipes for each shift (no more than 12 hours);
and B3, visually comparing the steel outer protective pipe with a corresponding photo or a standard plate during rust removal treatment, wherein the surface rust removal quality is up to SS2.5 grade, the anchor line depth range is 50-90 mu m, and welding slag, burrs and the like on the surface of the steel outer protective pipe are removed completely so as to facilitate the next operation.
The temperature control processing method of the steel outer protection pipe in the step S2 includes: the steel outer protection pipe is heated by adopting a medium-frequency heating mode, the temperature range of medium-frequency heating is generally 35-45 ℃, the surface temperature of the steel outer protection pipe is not more than 50 ℃, the surface temperature of the steel outer protection pipe is more than the dew point temperature of the steel outer protection pipe, the temperature difference between the surface temperature of the steel outer protection pipe and the dew point temperature of the steel outer protection pipe is more than 3 ℃, the steel outer protection pipe is heated to a determined temperature by adopting the medium-frequency heating mode during detection, and the highest temperature is not more than 50 ℃.
The process rating test method in step S6 is: and (3) detecting the performances of the three anticorrosive layers and the external anticorrosive layer, and when the coating is actually used, a coating factory applies the selected anticorrosive layer material to perform a process evaluation test on a coating production line and detects the three anticorrosive layers and the external anticorrosive layer. When the three-layer anticorrosive layer material manufacturer, brand (type) number or steel pipe diameter or wall thickness is increased, the process evaluation test is carried out again. And after the process evaluation test is qualified, the coating factory performs coating production of the three-layer anticorrosive layer according to the process parameters determined by the process evaluation test, and provides a process evaluation report and a detection report.
The external anticorrosive layer should satisfy the following indexes:
tensile strength: the axial direction is more than or equal to 20MPa, the circumferential direction is more than or equal to 20MPa, and the deviation is less than or equal to 15 percent;
nominal strain at break: more than or equal to 600 percent;
indentation hardness: less than or equal to 0.2mm (23 ℃) and less than or equal to 0.3mm (60 or 80 ℃);
environmental stress cracking resistance (F50) is more than or equal to 1000 h;
thermal stability ▏ Δ MFR ▏: less than or equal to 20 percent.
The performance indexes of the three-layer structure anticorrosive coating meet the following requirements:
peel strength: not less than 100N/mm (20 +/-5 ℃) (cohesive failure) and not less than 70N/mm (60 +/-5 ℃) (cohesive failure);
cathodic disbonding (65 ℃, 48 h): less than or equal to 5 mm;
cathodic disbonding (65 ℃, 30 d): less than or equal to 15 mm;
glass transition temperature change value ▏ Δ Tg ▏ of epoxy powder primer: less than or equal to 5 ℃;
impact strength: not less than 8J/mm;
bending resistance (-30 ℃, 2.5 °): the polyethylene has no cracking;
soaking in hot water (80 ℃, 48 h): the depth of the raised edge is less than or equal to 2mm on average and less than or equal to 3mm at the maximum.
The quality inspection method of the three-layer anticorrosive coating in the step S6 comprises the following steps:
c1, detecting the appearance of the external anticorrosive layer, wherein during detection, workers should visually inspect the appearance of the external anticorrosive layer one by one, the surface of the external anticorrosive layer should be smooth, and the external anticorrosive layer should have no dark bubbles, no pits, no wrinkles, no cracks, uniform color and no raised edges at the end of the anticorrosive pipe;
and C2, detecting the leakage points of the three-layer anticorrosive coating, wherein during detection, a worker continuously detects the leakage points of the three-layer anticorrosive coating by using an online electric spark leak detector, the leak detection voltage is 25KV, and no leakage point is qualified. When the single tube has two or less than two leakage points, workers can repair the single tube; when the single pipe has more than two leakage points or a single leakage point is larger than 300mm along the axial dimension, the anti-corrosion pipe is unqualified.
C3, detecting the thickness of the three-layer anticorrosive layer, and detecting the thickness and the thermal property of the epoxy powder layer; the method comprises the following steps that a worker measures the thicknesses of three layers of anticorrosive coatings of 4 points uniformly distributed in the circumferential direction of 3 sections of a steel outer protection pipe by using a magnetic thickness gauge or an electronic thickness gauge, and the thicknesses of the three layers of anticorrosive coatings at a welding seam are measured, wherein the thickness standard of the three layers of anticorrosive coatings is shown in table 1;
TABLE 1 thickness of three anticorrosive layers
And C4, carrying out cathode stripping test detection on the anticorrosive pipes, and carrying out a cathode stripping test for 48 hours by a worker for each specification of anticorrosive pipes. If the corrosion-resistant pipe is not qualified, the corrosion-resistant pipe coated after the previous inspection is subjected to double sampling inspection. When all the corrosion-resistant pipes are qualified by double inspection, the corrosion-resistant pipes produced in the two monitoring intervals are qualified; when the corrosion-resistant pipes are still unqualified, the batch of corrosion-resistant pipes produced in the two detection intervals is unqualified, so that the qualification degree of the corrosion-resistant pipes is accurately controlled;
c5, testing the tensile strength and the fracture nominal strain of the anti-corrosion pipe; the worker should take a sample of the polyethylene layer for testing every 50Km of continuous production. If the corrosion-resistant pipe is not qualified, the corrosion-resistant pipe coated after the previous inspection is qualified is subjected to double sampling inspection. And when all the corrosion-resistant pipes are qualified after double inspection, the corrosion-resistant pipes produced in the two detection intervals are qualified, and when the corrosion-resistant pipes produced in the two detection intervals are still unqualified, the corrosion-resistant pipes produced in batches in the two detection intervals are unqualified.
In addition, the staff should pay attention to the following problems in the identification, stacking and protection of the anti-corrosion pipe:
and spraying and printing the color-fading-resistant white marks at two ends 500mm away from the pipe end of the qualified anticorrosive pipe, wherein the two ends are subjected to 180-degree staggered spraying and printing. Product identification should include: the type, the anticorrosion grade, the execution standard, the name (code) of a manufacturing factory, the production date and the like of the anticorrosion layer structure, the anticorrosion layer and the like, and the steel pipe identification information is displaced to the surface of the anticorrosion layer;
the anti-corrosion pipes are bound by adopting flexible materials, so that the anti-corrosion layer is prevented from being damaged in the stacking and transporting processes, and at least 3 binding paths are formed for each anti-corrosion pipe;
stacking the layers: the number of stacked anticorrosion tubes is not less than 800 DN and not more than 1200, the number of stacked anticorrosion tubes is not more than 2 when the number of stacked anticorrosion tubes is more than 1200 and not more than 1600, and only 1 anticorrosion tube can be stacked when the number of stacked anticorrosion tubes is more than 1600;
the open-air storage time of the anti-corrosion pipe is not longer than 6 months, and if the anti-corrosion pipe needs to be stored for more than 6 months, the anti-corrosion pipe is protected by using an opaque covering.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A three PE anticorrosion method for a steel outer protection pipe is characterized by comprising the following steps: comprises the following steps;
s1, performing primary cleaning treatment on the outer surface of the steel outer protective pipe;
s2, performing temperature control treatment on the outer surface of the steel outer protecting pipe;
s3, carrying out rust removal treatment on the outer surface of the steel outer protection pipe, and carrying out quality inspection on the steel outer protection pipe;
s4, coating an epoxy powder coating, an adhesive layer and an external anticorrosive layer on the outer wall of the steel outer protection pipe from inside to outside in sequence, wherein the epoxy powder coating, the adhesive layer and the external anticorrosive layer form three anticorrosive layers;
s5, removing the three anti-corrosion layers at the pipe end part after the coating of the three anti-corrosion layers of the steel outer protection pipe is finished, wherein the reserved length range of the pipe end is 150-180 mm;
and S6, carrying out process evaluation test and quality inspection on the three-layer anticorrosive layer.
2. The tri-PE corrosion prevention method for the steel outer protection pipe according to claim 1, wherein the method comprises the following steps: the material of the external anti-corrosion layer in step S4 is reinforced, normal temperature polyethylene material.
3. The tri-PE corrosion prevention method for the steel outer protection pipe according to claim 1, wherein the method comprises the following steps: and forming a chamfer on the section of the three anti-corrosion layers in the step S5, wherein the chamfer is an acute angle, the chamfer range is not more than 30 degrees, and 20mm of epoxy powder coating is reserved outside the end part of the outer anti-corrosion layer.
4. The tri-PE corrosion prevention method for the steel outer protection pipe according to claim 1, wherein the method comprises the following steps: the quality inspection method of the steel outer protection pipe in the step S3 includes:
b1, detecting the dust degree of the surface of the steel outer protective pipe;
b2, measuring the salt content on the surface of the steel outer protective pipe, wherein the salt content is not more than 20mg/m2；
And B3, visually comparing the corresponding pictures or standard plates when the steel outer protective pipe is subjected to rust removal treatment, wherein the surface rust removal quality is up to SS2.5 grade, and the anchor line depth range is 50-90 mu m.
5. The tri-PE corrosion prevention method for the steel outer protection pipe according to claim 1, wherein the method comprises the following steps: the temperature control processing method of the steel outer protection pipe in the step S2 includes: the steel outer protection pipe is heated by adopting a medium-frequency heating mode, the temperature range of medium-frequency heating is generally 35-45 ℃, the surface temperature of the steel outer protection pipe is not more than 50 ℃, the surface temperature of the steel outer protection pipe is higher than the dew point temperature of the steel outer protection pipe, and the temperature difference between the surface temperature of the steel outer protection pipe and the dew point temperature of the steel outer protection pipe is higher than 3 ℃.
6. The tri-PE corrosion prevention method for the steel outer protection pipe according to claim 1, wherein the method comprises the following steps: the process rating test method in step S6 is: and detecting the performances of the three anticorrosive layers and the external anticorrosive layer.
7. The tri-PE corrosion prevention method for the steel outer protection pipe according to claim 1, wherein the method comprises the following steps: the quality inspection method of the three-layer anticorrosive coating in the step S6 comprises the following steps:
c1, detecting the appearance of the external anticorrosive layer;
c2, detecting the leakage point of the three-layer anticorrosive coating;
c3, detecting the thickness of the three-layer anticorrosive layer, and detecting the thickness and the thermal property of the epoxy powder layer;
c4, carrying out cathodic disbonding test detection on the anticorrosion pipe;
and C5, testing the tensile strength and the fracture nominal strain of the anticorrosive pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011148735.0A CN112682618A (en) | 2020-10-23 | 2020-10-23 | three-PE corrosion prevention method for steel outer protection pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011148735.0A CN112682618A (en) | 2020-10-23 | 2020-10-23 | three-PE corrosion prevention method for steel outer protection pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112682618A true CN112682618A (en) | 2021-04-20 |
Family
ID=75447326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011148735.0A Pending CN112682618A (en) | 2020-10-23 | 2020-10-23 | three-PE corrosion prevention method for steel outer protection pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112682618A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001347222A (en) * | 2000-06-08 | 2001-12-18 | Nippon Steel Corp | Method for applying primer for steel corrosion proofing |
| CN1704639A (en) * | 2004-05-25 | 2005-12-07 | 上海中油埃力生防腐有限公司 | Three-layer structured polypropylene anticorrosive technology for steel buried transportation pipe |
| CN102052543A (en) * | 2009-11-10 | 2011-05-11 | 上海海隆防腐技术工程有限公司 | Composite polyethylene (PE) powder thermally sprayed anticorrosion coating for petroleum and natural gas pipe |
| CN108716574A (en) * | 2018-06-19 | 2018-10-30 | 广汉华气防腐工程有限公司 | A kind of high durable anti-corrosion pipe production technology |
| CN109127316A (en) * | 2018-06-29 | 2019-01-04 | 中国石油天然气集团有限公司 | A kind of welded still pipe outer surface epoxy layer antisepsis production line and anticorrosion process |
| CN109210282A (en) * | 2018-10-23 | 2019-01-15 | 山东禹王管业有限公司 | A kind of heavy caliber anti-corrosive steel tube and manufacture craft |
| CN109772634A (en) * | 2019-01-21 | 2019-05-21 | 宝鸡石油钢管有限责任公司 | A kind of full powder corrosion-proof production line of novel outer surface of steel tube 3PE and anticorrosion process |
-
2020
- 2020-10-23 CN CN202011148735.0A patent/CN112682618A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001347222A (en) * | 2000-06-08 | 2001-12-18 | Nippon Steel Corp | Method for applying primer for steel corrosion proofing |
| CN1704639A (en) * | 2004-05-25 | 2005-12-07 | 上海中油埃力生防腐有限公司 | Three-layer structured polypropylene anticorrosive technology for steel buried transportation pipe |
| CN102052543A (en) * | 2009-11-10 | 2011-05-11 | 上海海隆防腐技术工程有限公司 | Composite polyethylene (PE) powder thermally sprayed anticorrosion coating for petroleum and natural gas pipe |
| CN108716574A (en) * | 2018-06-19 | 2018-10-30 | 广汉华气防腐工程有限公司 | A kind of high durable anti-corrosion pipe production technology |
| CN109127316A (en) * | 2018-06-29 | 2019-01-04 | 中国石油天然气集团有限公司 | A kind of welded still pipe outer surface epoxy layer antisepsis production line and anticorrosion process |
| CN109210282A (en) * | 2018-10-23 | 2019-01-15 | 山东禹王管业有限公司 | A kind of heavy caliber anti-corrosive steel tube and manufacture craft |
| CN109772634A (en) * | 2019-01-21 | 2019-05-21 | 宝鸡石油钢管有限责任公司 | A kind of full powder corrosion-proof production line of novel outer surface of steel tube 3PE and anticorrosion process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107401655A (en) | Metal pipe line defect recognition and no-welding method for maintaining | |
| Jadoon et al. | Fusion bonded epoxy mainline and field joint coatings performance from the X100 field trial–A case study | |
| CN112682618A (en) | three-PE corrosion prevention method for steel outer protection pipe | |
| Sotoodeh | Piping engineering: preventing fugitive emission in the oil and gas industry | |
| CN110726075A (en) | Manufacturing process of anti-corrosion gas pipeline with embedded metalized optical fiber sensor | |
| Norman et al. | Three layer polyolefin coatings: fulfilling their potential? | |
| CN112460380B (en) | Clamping plate type on-site joint coating method for heat-insulating pipeline | |
| Roche | An experience in offshore pipeline coatings | |
| El-Sherik et al. | Guidelines for investigating failures of external FBE coatings on buried pipelines. | |
| Moosavi et al. | Failure analysis of three layer polypropylene pipeline coatings | |
| CN114370555B (en) | Method for corrosion-proof heat-insulating waterproof integrated joint coating of heat-insulating pipeline | |
| KR102032202B1 (en) | Coated corrugated steel pipe with a film that is easy to repair the damaged coating layer | |
| CN113848170B (en) | Method for detecting performance of pipeline anti-corrosion layer | |
| KR102404202B1 (en) | Structural pipe rehabilitation method using high-performance polyurea | |
| Thomas et al. | 2-Layer Polyethylene Extruded Factory-Applied Pipe Corrosion Coating | |
| Arabey | Corrosion cracking of pipe metal on main gas pipelines: a retrospective and new challenges | |
| CN113848228B (en) | Method for detecting performance of pipeline anti-corrosion layer | |
| CN112536963A (en) | Elbow straight-through production process of heat-insulating pipeline | |
| Gaber | Impact of Anti-Corrosion Liquid Epoxy and Fusion Bond Epoxy Primer on Mechanical Testing of Three Layers Polyethylene Pipeline Coating | |
| Surkein et al. | Trends in pipe coating selection process | |
| Bowman et al. | Finding the Smoking Gun: Lessons Learned from an HDD Coatings Challenge (Coatings Applications Aren't as Simple as They Appear) | |
| Eun et al. | Fabrication and Construction of Equipment and Piping | |
| Reed et al. | Coatings Cracking in Water Ballast Tanks: A Different Look | |
| Gholami et al. | Stress Corrosion Crack Identification with Direct Assessment Method in Pipeline Downstream from a Compressor Station | |
| Suzuki et al. | Study of Corrosion-Protection Technologies in Splash and Tidal Zones Establishment of Corrosion-Protection Technologies to Provide Long-Term Durability at Low Cost for Offshore Steel Structures by Use of Methods for Wrapping of Highly Corrosion-Resistant Metallic Materials |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210420 |
|
| RJ01 | Rejection of invention patent application after publication |